US 12,292,676 B2
Illumination system for projector
Chih-Hao Lin, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Oct. 18, 2022, as Appl. No. 18/047,645.
Claims priority of application No. 202210803174.6 (CN), filed on Jul. 7, 2022.
Prior Publication US 2024/0012319 A1, Jan. 11, 2024
Int. Cl. G03B 21/20 (2006.01)
CPC G03B 21/204 (2013.01) [G03B 21/2066 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An illumination system for a projector, comprising:
a light engine module;
a light source module, wherein a first direction is defined from the light source module to the light engine module, and the light source module is configured to emit blue light along the first direction;
a reflective mirror configured to reflect the blue light such that the blue light transmits in a second direction;
a first beam splitter having a blue light transmissive region and a reflective region, wherein the blue light transmissive region of the first beam splitter is configured to allow the blue light that transmits in the second direction to pass through;
a phosphor wheel having a reflective region and a first wavelength conversion region, wherein the reflective region of the phosphor wheel is configured to reflect a first portion of the blue light, and the first wavelength conversion region is configured to activate a second portion of the blue light to form first band light; and
a lens assembly located between the first beam splitter and the phosphor wheel, configured to refract the blue light that transmits in the second direction to the phosphor wheel, configured to refract the first portion of the blue light to the reflective region of the first beam splitter in a third direction opposite to the second direction, and configured to allow the first band light to pass through, wherein the reflective region of the first beam splitter is configured to reflect the first portion of the blue light and the first band light to the light engine module along the first direction.